gdb/

* main.c (captured_main): Remove 'count' varible and the
	ALIGN_STACK_ON_ENTRY block that used it.  Error out if --core and
	--pid options were issued simultaneously.  If an explicit pid
	option was passed, don't fallback to core file.  Detect extra
	arguments better in the presence of explicit pid or core
	arguments.

	gdb/doc/
	* gdbint.texinfo (Host Conditionals): Remove mention of
	ALIGN_STACK_ON_ENTRY.

gdb/ChangeLog

@@ -1,3 +1,12 @@
+2008-01-05  Pedro Alves  <pedro@codesourcery.com>
+
+	* main.c (captured_main): Remove 'count' varible and the
+	ALIGN_STACK_ON_ENTRY block that used it.  Error out if --core and
+	--pid options were issued simultaneously.  If an explicit pid
+	option was passed, don't fallback to core file.  Detect extra
+	arguments better in the presence of explicit pid or core
+	arguments.
+
 2008-01-05  Joel Brobecker  <brobecker@adacore.com>
 
 	* ada-lang.c (ada_which_variant_applies): Correctly compute

gdb/doc/ChangeLog

@@ -1,3 +1,8 @@
+2008-01-05  Pedro Alves  <pedro@codesourcery.com>
+
+	* gdbint.texinfo (Host Conditionals): Remove mention of
+	ALIGN_STACK_ON_ENTRY.
+
 2008-01-05  Joel Brobecker  <brobecker@adacore.com>
 
 	* gdbint.texinfo (Start of New Year Procedure): Add item

gdb/doc/gdbint.texinfo

@@ -2490,13 +2490,6 @@ of a function to be called if @code{SIGWINCH} is received.
 Define this to expand into code that will define the function named by
 the expansion of @code{SIGWINCH_HANDLER}.
 
-@item ALIGN_STACK_ON_STARTUP
-@cindex stack alignment
-Define this if your system is of a sort that will crash in
-@code{tgetent} if the stack happens not to be longword-aligned when
-@code{main} is called.  This is a rare situation, but is known to occur
-on several different types of systems.
-
 @item CRLF_SOURCE_FILES
 @cindex DOS text files
 Define this if host files use @code{\r\n} rather than @code{\n} as a

gdb/main.c

@@ -119,7 +119,6 @@ captured_main (void *data)
   struct captured_main_args *context = data;
   int argc = context->argc;
   char **argv = context->argv;
-  int count;
   static int quiet = 0;
   static int batch = 0;
   static int set_args = 0;
@@ -127,7 +126,9 @@ captured_main (void *data)
   /* Pointers to various arguments from command line.  */
   char *symarg = NULL;
   char *execarg = NULL;
+  char *pidarg = NULL;
   char *corearg = NULL;
+  char *pid_or_core_arg = NULL;
   char *cdarg = NULL;
   char *ttyarg = NULL;
 
@@ -175,12 +176,6 @@ captured_main (void *data)
   lim_at_start = (char *) sbrk (0);
 #endif
 
-#if defined (ALIGN_STACK_ON_STARTUP)
-  i = (int) &count & 0x3;
-  if (i != 0)
-    alloca (4 - i);
-#endif
-
   cmdsize = 1;
   cmdarg = (struct cmdarg *) xmalloc (cmdsize * sizeof (*cmdarg));
   ncmd = 0;
@@ -435,8 +430,7 @@ captured_main (void *data)
 	    corearg = optarg;
 	    break;
 	  case 'p':
-	    /* "corearg" is shared by "--core" and "--pid" */
-	    corearg = optarg;
+	    pidarg = optarg;
 	    break;
 	  case 'x':
 	    cmdarg[ncmd].type = CMDARG_FILE;
@@ -572,26 +566,34 @@ extern int gdbtk_test (char *);
       }
     else
       {
-	/* OK, that's all the options.  The other arguments are filenames.  */
-	count = 0;
-	for (; optind < argc; optind++)
-	  switch (++count)
-	    {
-	    case 1:
-	      symarg = argv[optind];
-	      execarg = argv[optind];
-	      break;
-	    case 2:
-	      /* The documentation says this can be a "ProcID" as well. 
-	         We will try it as both a corefile and a pid.  */
-	      corearg = argv[optind];
-	      break;
-	    case 3:
-	      fprintf_unfiltered (gdb_stderr,
-				  _("Excess command line arguments ignored. (%s%s)\n"),
-				  argv[optind], (optind == argc - 1) ? "" : " ...");
-	      break;
-	    }
+	/* OK, that's all the options.  */
+
+	/* The first argument, if specified, is the name of the
+	   executable.  */
+	if (optind < argc)
+	  {
+	    symarg = argv[optind];
+	    execarg = argv[optind];
+	    optind++;
+	  }
+
+	/* If the user hasn't already specified a PID or the name of a
+	   core file, then a second optional argument is allowed.  If
+	   present, this argument should be interpreted as either a
+	   PID or a core file, whichever works.  */
+	if (pidarg == NULL && corearg == NULL && optind < argc)
+	  {
+	    pid_or_core_arg = argv[optind];
+	    optind++;
+	  }
+
+	/* Any argument left on the command line is unexpected and
+	   will be ignored.  Inform the user.  */
+	if (optind < argc)
+	  fprintf_unfiltered (gdb_stderr, _("\
+Excess command line arguments ignored. (%s%s)\n"),
+			      argv[optind],
+			      (optind == argc - 1) ? "" : " ...");
       }
     if (batch)
       quiet = 1;
@@ -733,21 +735,31 @@ extern int gdbtk_test (char *);
 	catch_command_errors (symbol_file_add_main, symarg, 0, RETURN_MASK_ALL);
     }
 
+  if (corearg && pidarg)
+    error (_("\
+Can't attach to process and specify a core file at the same time."));
+
   if (corearg != NULL)
+    catch_command_errors (core_file_command, corearg,
+			  !batch, RETURN_MASK_ALL);
+  else if (pidarg != NULL)
+    catch_command_errors (attach_command, pidarg,
+			  !batch, RETURN_MASK_ALL);
+  else if (pid_or_core_arg)
     {
-      /* corearg may be either a corefile or a pid.
-	 If its first character is a digit, try attach first
-	 and then corefile.  Otherwise try corefile first. */
+      /* The user specified 'gdb program pid' or gdb program core'.
+	 If pid_or_core_arg's first character is a digit, try attach
+	 first and then corefile.  Otherwise try just corefile.  */
 
-      if (isdigit (corearg[0]))
+      if (isdigit (pid_or_core_arg[0]))
 	{
-	  if (catch_command_errors (attach_command, corearg, 
+	  if (catch_command_errors (attach_command, pid_or_core_arg,
 				    !batch, RETURN_MASK_ALL) == 0)
-	    catch_command_errors (core_file_command, corearg, 
+	    catch_command_errors (core_file_command, pid_or_core_arg,
 				  !batch, RETURN_MASK_ALL);
 	}
-      else /* Can't be a pid, better be a corefile. */
-	catch_command_errors (core_file_command, corearg, 
+      else /* Can't be a pid, better be a corefile.  */
+	catch_command_errors (core_file_command, pid_or_core_arg,
 			      !batch, RETURN_MASK_ALL);
     }